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I don't see anything wrong with you code. So I guess the inputs may bring something wrong. Pay attention to that. Try to print out the final SQL statement to detect where the problem is.

Of course 'a' can reference a J_SubClass which is a subtype of J_SuperClass which is declared type of 'a'.

In Eclipse you can install Window Builder to design GUI just like in NetBeans.

Hi guys,

Thinking in Java is obsolete. I think Head First Java or Java, A Beginner Guide is more appropriate.

Here are some recommends:

Most Recommended Core Java Books for Serious...

Yes, both Head First Java and Thinking in Java are quite old, but the Java language hasn't changed very much since version 1.5, so readers can still be beneficial from these books.

Remember these...

Folks,

Here are the two best books for Java beginners (but not beginner in programming):

Head First Java, 2nd edition

Thinking in Java, 4th edition

Both include Swing chapter.

If your Java = 0, then even you cannot start with the 5 technologies you mentioned. Starting with basic Java is a must. And there are lot of tutorials out there.

You can only use 'localhost' if the code is running in the same machine with the database. Otherwise, you have to use exact host name.
From the exception, it looks like that you are trying to...

Abstract methods/classes leave detailed implementation to sub classes, and every sub classes may implement differently, thus leads to polymorphism in OOP.

Looks like you need some kind of scheduler in Spring? Try to check Spring AMQP.

integers are assigned 0 value by default, and objects (String is one of) are assigned null by default.
So there is no difference if you write:


int age = 0;

and


int age;

Hi aussiemcgr,

If you are still stuck with signing applet issue, this can be of help: How to sign a Java applet

The database URL is invalid so JDBC couldn't find an appropriate driver:


jdbc:microsoft:SQLSERVER://SQLEXPRESS:Student

It should be:

...

Hi hafiz013,

you are newbie, try to follow this step by step tutorial: Connect to MySQL database via JDBC

Here what you need definitely (configure upload limit as well as file types):

Upload file with Struts 2

There are some open source out there: iTextPDF, JPedal... I created such a program using JPedal and it runs very well. If you are interesting, please PM me.

Here's my recommendation:

How to create Jar file in Eclipse

If you are newbie to Spring, I'd suggest you go with this tutorials:

- Understanding the core of Spring framework.
- Understanding Spring MVC
- Understanding Spring AOP

hi viper75,

I found a good tutorial on how to deploy a Java web application on Tomcat.

you must enclose the values inside single quote marks ( ' ), for example:


String sql = "INSERT INTO TheData (IPAddress, URL, IPClass) VALUES ('" + address.getHostAddress() + "')";

However,...

Hi vilkas,

You can find some good examples about final keyword here.

Hope this helps.

looks like you are missing an open brace in the if statement.

thanks for sharing your idea. Have you got started? Did you face any problems?

This article explains how to upload files to FTP server using Apache commons net in depth:

How to upload files to FTP server

It's hard to help without any detailed exception/error faced by the original poster.
However you can see a working example regarding send e-mail with attachment.